namerror message patch

README.md

$ ruby test_before.rb # before patch
3.7357151369942585
$ ruby test.rb # after patch
1.2525334189995192

3.7357151369942585 / 1.2525334189995192 * 1000000 => 2982527.3164992435 times faster!

test.rb

require 'benchmark'
str = 'a' * 500_000_000

begin
  str.a
rescue => ex
  p Benchmark.realtime {1000000.times {ex.message} }
end

test_before.rb

require 'benchmark'
str = 'a' * 500_000_000

begin
  str.a
rescue => ex
  p Benchmark.realtime {ex.message }
end